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<p>Creates the directory specified by FILENAME, with permissions specified by MODE (as modified by <a href="umask.html"><code>umask</code></a>). If it succeeds it returns true; otherwise it returns false and sets <a href="../perlvar.html#%24%21"><code>$!</code></a> (errno). MODE defaults to 0777 if omitted, and FILENAME defaults to <a href="../perlvar.html#%24_"><code>$_</code></a> if omitted.</p>

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